CRUD Operations in ASP.NET MVC Using AJAX and Bootstrap

Datetime:2016-08-22 22:20:15          Topic: ASP.NET  Ajax  Bootstrap           Share

This article shows, how to perform CRUD Operations in ASP.NET MVC, using AJAX and Bootstrap. In previous ASP.NET MVC tutorials of this series, we saw,

What is AJAX and Bootstrap?

AJAX (Asynchronous JavaScript and XML) is used to update parts of the existing page and to retrieve the data from the server asynchronously. AJAX improves the performance of the web application and makes the application more interactive.

Bootstrap is the one of the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web.

Let’s Begin

Create a new ASP.NET web application.

Select Empty ASP.NET MVC template and click OK.

Now, right-click on the project and click Manage NuGet Packages.

Search for Bootstrap and then click Install button.

After installing the package, you will see the Content and Scripts folder being added in your Solution Explorer.

Now, create a database and add a table (named Employee). The following is the schema for creating a table Employee:

After the table creation, create the stored procedures for Select, Insert, Update, and Delete operations.

--Select Employees
Create Procedure SelectEmployee 
as  
Begin 
Select * from Employee; 
End

--Insert and Update Employee
Create Procedure InsertUpdateEmployee 
( 
@Id integer, 
@Name nvarchar(50), 
@Age integer, 
@State nvarchar(50), 
@Country nvarchar(50), 
@Action varchar(10) 
) 
As 
Begin 
if @Action='Insert' 
Begin 
 Insert into Employee(Name,Age,[State],Country) values(@Name,@Age,@State,@Country); 
End 
if @Action='Update' 
Begin 
 Update Employee set Name=@Name,Age=@Age,[State]=@State,Country=@Country where EmployeeID=@Id; 
End   
End

--Delete Employee
Create Procedure DeleteEmployee 
( 
 @Id integer 
) 
as  
Begin 
 Delete Employee where EmployeeID=@Id; 
End

Right click on Modal Folder and add the Employee.cs class.

Employee.cs Code

public class Employee
{
    public int EmployeeID { get; set; }

    public string Name { get; set; }
       
    public int Age { get; set; }
       
    public string State { get; set; }
       
    public string Country { get; set; }
}

Now, add another class in Modal Folder named EmployeeDB.cs for the database-related operations. In this example, I am going to use ADO.NET to access the data from the database.

public class EmployeeDB
    {
        //declare connection string
        string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;

        //Return list of all Employees
        public List<Employee> ListAll()
        {
            List<Employee> lst = new List<Employee>();
            using(SqlConnection con=new SqlConnection(cs))
            {
                con.Open();
                SqlCommand com = new SqlCommand("SelectEmployee",con);
                com.CommandType = CommandType.StoredProcedure;
                SqlDataReader rdr = com.ExecuteReader();
                while(rdr.Read())
                {
                    lst.Add(new Employee {
                        EmployeeID=Convert.ToInt32(rdr["EmployeeId"]),
                        Name=rdr["Name"].ToString(),
                        Age = Convert.ToInt32(rdr["Age"]),
                        State = rdr["State"].ToString(),
                        Country = rdr["Country"].ToString(),
                    });
                }
                return lst;
            }
        }

        //Method for Adding an Employee
        public int Add(Employee emp)
        {
            int i;
            using(SqlConnection con=new SqlConnection(cs))
            {
                con.Open();
                SqlCommand com = new SqlCommand("InsertUpdateEmployee", con);
                com.CommandType = CommandType.StoredProcedure;
                com.Parameters.AddWithValue("@Id",emp.EmployeeID);
                com.Parameters.AddWithValue("@Name", emp.Name);
                com.Parameters.AddWithValue("@Age", emp.Age);
                com.Parameters.AddWithValue("@State", emp.State);
                com.Parameters.AddWithValue("@Country", emp.Country);
                com.Parameters.AddWithValue("@Action", "Insert");
                i = com.ExecuteNonQuery();
            }
            return i;
        }

        //Method for Updating Employee record
        public int Update(Employee emp)
        {
            int i;
            using (SqlConnection con = new SqlConnection(cs))
            {
                con.Open();
                SqlCommand com = new SqlCommand("InsertUpdateEmployee", con);
                com.CommandType = CommandType.StoredProcedure;
                com.Parameters.AddWithValue("@Id", emp.EmployeeID);
                com.Parameters.AddWithValue("@Name", emp.Name);
                com.Parameters.AddWithValue("@Age", emp.Age);
                com.Parameters.AddWithValue("@State", emp.State);
                com.Parameters.AddWithValue("@Country", emp.Country);
                com.Parameters.AddWithValue("@Action", "Update");
                i = com.ExecuteNonQuery();
            }
            return i;
        }

        //Method for Deleting an Employee
        public int Delete(int ID)
        {
            int i;
            using (SqlConnection con = new SqlConnection(cs))
            {
                con.Open();
                SqlCommand com = new SqlCommand("DeleteEmployee", con);
                com.CommandType = CommandType.StoredProcedure;
                com.Parameters.AddWithValue("@Id", ID);
                i = com.ExecuteNonQuery();
            }
            return i;
        }
    }

Right click on the Controllers folder, add an Empty Controller, and name it HomeController.

Now, open HomeController and add the following action methods:

public class HomeController : Controller
    {
        EmployeeDB empDB = new EmployeeDB();
        // GET: Home
        public ActionResult Index()
        {
            return View();
        }
        public JsonResult List()
        {
            return Json(empDB.ListAll(),JsonRequestBehavior.AllowGet);
        }
        public JsonResult Add(Employee emp)
        {
            return Json(empDB.Add(emp), JsonRequestBehavior.AllowGet);
        }
        public JsonResult GetbyID(int ID)
        {
            var Employee = empDB.ListAll().Find(x => x.EmployeeID.Equals(ID));
            return Json(Employee, JsonRequestBehavior.AllowGet);
        }
        public JsonResult Update(Employee emp)
        {
            return Json(empDB.Update(emp), JsonRequestBehavior.AllowGet);
        }
        public JsonResult Delete(int ID)
        {
            return Json(empDB.Delete(ID), JsonRequestBehavior.AllowGet);
        }
    }

Right click on the Index action method of HomeController and click on Add View. As we are going to use Bootstrap and AJAX, we have to add their relative Scripts and CSS references in the head section of the view. I have also added employee.js, which will contain all AJAX code, that are required for CRUD operations.

<script src="~/Scripts/jquery-1.9.1.js"></script>
<script src="~/Scripts/bootstrap.js"></script>
<link href="~/Content/bootstrap.css" rel="stylesheet" />
<script src="~/Scripts/employee.js"></script>

Add the code, given below, in Index.cshtml view:

<div class="container">
        <h2>Employees Record</h2>
        <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal" onclick="clearTextBox();">Add New Employee</button><br /><br />
        <table class="table table-bordered table-hover">
            <thead>
                <tr>
                    <th>
                        ID
                    </th>
                    <th>
                        Name
                    </th>
                    <th>
                        Age
                    </th>
                    <th>
                        State
                    </th>
                    <th>
                        Country
                    </th>
                    <th>
                        Action
                    </th>
                </tr>
            </thead>
            <tbody class="tbody">

            </tbody>
        </table>
    </div>
    <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    @*<button type="button" class="close" data-dissmiss="modal"><span aria-hidden="true">×</span></button>*@
                    <button type="button" class="close" data-dismiss="modal">×</button>
                    <h4 class="modal-title" id="myModalLabel">Add Employee</h4>
                </div>
                <div class="modal-body">
                    <form>
                        <div class="form-group">
                            <label for="EmployeeId">ID</label>
                            <input type="text" class="form-control" id="EmployeeID" placeholder="Id" disabled="disabled"/>
                        </div>
                        <div class="form-group">
                            <label for="Name">Name</label>
                            <input type="text" class="form-control" id="Name" placeholder="Name"/>
                        </div>
                        <div class="form-group">
                            <label for="Age">Age</label>
                            <input type="text" class="form-control" id="Age" placeholder="Age" />
                        </div>
                        <div class="form-group">
                            <label for="State">State</label>
                            <input type="text" class="form-control" id="State" placeholder="State"/>
                        </div>
                        <div class="form-group">
                            <label for="Country">Country</label>
                            <input type="text" class="form-control" id="Country" placeholder="Country"/>
                        </div>
                    </form>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-primary" id="btnAdd" onclick="return Add();">Add</button>
                    <button type="button" class="btn btn-primary" id="btnUpdate" style="display:none;" onclick="Update();">Update</button>
                    <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                </div>
            </div>
        </div>       
    </div>

In the code, given above, we have added a button for adding a New Employee. On clicking, It will open the modal dialog box of the bootstrap, which contains several fields of the employees for saving. We have also added a table, which will be populated with the use of AJAX.

Employee.js Code

//Load Data in Table when documents is ready
$(document).ready(function () {
    loadData();
});

//Load Data function
function loadData() {
    $.ajax({
        url: "/Home/List",
        type: "GET",
        contentType: "application/json;charset=utf-8",
        dataType: "json",
        success: function (result) {
            var html = '';
            $.each(result, function (key, item) {
                html += '<tr>';
                html += '<td>' + item.EmployeeID + '</td>';
                html += '<td>' + item.Name + '</td>';
                html += '<td>' + item.Age + '</td>';
                html += '<td>' + item.State + '</td>';
                html += '<td>' + item.Country + '</td>';
                html += '<td><a href="#" onclick="return getbyID(' + item.EmployeeID + ')">Edit</a> | <a href="#" onclick="Delele(' + item.EmployeeID + ')">Delete</a></td>';
                html += '</tr>';
            });
            $('.tbody').html(html);
        },
        error: function (errormessage) {
            alert(errormessage.responseText);
        }
    });
}

//Add Data Function
function Add() {
    var res = validate();
    if (res == false) {
        return false;
    }
    var empObj = {
        EmployeeID: $('#EmployeeID').val(),
        Name: $('#Name').val(),
        Age: $('#Age').val(),
        State: $('#State').val(),
        Country: $('#Country').val()
    };
    $.ajax({
        url: "/Home/Add",
        data: JSON.stringify(empObj),
        type: "POST",
        contentType: "application/json;charset=utf-8",
        dataType: "json",
        success: function (result) {
            loadData();
            $('#myModal').modal('hide');
        },
        error: function (errormessage) {
            alert(errormessage.responseText);
        }
    });
}

//Function for getting the Data Based upon Employee ID
function getbyID(EmpID) {
    $('#Name').css('border-color', 'lightgrey');
    $('#Age').css('border-color', 'lightgrey');
    $('#State').css('border-color', 'lightgrey');
    $('#Country').css('border-color', 'lightgrey');
    $.ajax({
        url: "/Home/getbyID/" + EmpID,
        typr: "GET",
        contentType: "application/json;charset=UTF-8",
        dataType: "json",
        success: function (result) {
            $('#EmployeeID').val(result.EmployeeID);
            $('#Name').val(result.Name);
            $('#Age').val(result.Age);
            $('#State').val(result.State);
            $('#Country').val(result.Country);

            $('#myModal').modal('show');
            $('#btnUpdate').show();
            $('#btnAdd').hide();
        },
        error: function (errormessage) {
            alert(errormessage.responseText);
        }
    });
    return false;
}

//function for updating employee's record
function Update() {
    var res = validate();
    if (res == false) {
        return false;
    }
    var empObj = {
        EmployeeID: $('#EmployeeID').val(),
        Name: $('#Name').val(),
        Age: $('#Age').val(),
        State: $('#State').val(),
        Country: $('#Country').val(),
    };
    $.ajax({
        url: "/Home/Update",
        data: JSON.stringify(empObj),
        type: "POST",
        contentType: "application/json;charset=utf-8",
        dataType: "json",
        success: function (result) {
            loadData();
            $('#myModal').modal('hide');
            $('#EmployeeID').val("");
            $('#Name').val("");
            $('#Age').val("");
            $('#State').val("");
            $('#Country').val("");
        },
        error: function (errormessage) {
            alert(errormessage.responseText);
        }
    });
}

//function for deleting employee's record
function Delele(ID) {
    var ans = confirm("Are you sure you want to delete this Record?");
    if (ans) {
        $.ajax({
            url: "/Home/Delete/" + ID,
            type: "POST",
            contentType: "application/json;charset=UTF-8",
            dataType: "json",
            success: function (result) {
                loadData();
            },
            error: function (errormessage) {
                alert(errormessage.responseText);
            }
        });
    }
}

//Function for clearing the textboxes
function clearTextBox() {
    $('#EmployeeID').val("");
    $('#Name').val("");
    $('#Age').val("");
    $('#State').val("");
    $('#Country').val("");
    $('#btnUpdate').hide();
    $('#btnAdd').show();
    $('#Name').css('border-color', 'lightgrey');
    $('#Age').css('border-color', 'lightgrey');
    $('#State').css('border-color', 'lightgrey');
    $('#Country').css('border-color', 'lightgrey');
}
//Valdidation using jquery
function validate() {
    var isValid = true;
    if ($('#Name').val().trim() == "") {
        $('#Name').css('border-color', 'Red');
        isValid = false;
    }
    else {
        $('#Name').css('border-color', 'lightgrey');
    }
    if ($('#Age').val().trim() == "") {
        $('#Age').css('border-color', 'Red');
        isValid = false;
    }
    else {
        $('#Age').css('border-color', 'lightgrey');
    }
    if ($('#State').val().trim() == "") {
        $('#State').css('border-color', 'Red');
        isValid = false;
    }
    else {
        $('#State').css('border-color', 'lightgrey');
    }
    if ($('#Country').val().trim() == "") {
        $('#Country').css('border-color', 'Red');
        isValid = false;
    }
    else {
        $('#Country').css('border-color', 'lightgrey');
    }
    return isValid;
}

Build and run the application.

Adding a Record (Preview)

Editing a Record (Preview)

Delete a Record(Preview)

I hope you like it. Thanks!





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